Are power transformers polalized? does it matter if the leads are reversed, does it affect rhe circut?

:Are power transformers polalized? does it matter if the leads are reversed, does it affect rhe circut?

Generally, for power transformers, no. Usually if it is important for a transformer to be connected with regard to polarity, there will be a little dot on the schematic, indicating the beginning of the winding. Certain audio and pulse transformers must be wired correctly, but the filament or rectifier couldn't care less of the power phasing.

Lewis L.

my radio has 3 heater windings, a 5 volt, and two 2.5 volt center tapped windings(one for 5 tubes and one for 2 tubes and the dial light). the transformer is completly fried , the radio is 100 watts so .8 amps , it blows 2.5 amp fuses. my new replacement has the same 5 volt, primary, and one 2.5 volt center tap, and one 2.5 volt non center tap. does the center tap do anything important in the heater circut?

This has the same questions as the unnamed post with Ian as the poster
reply to either

:my radio has 3 heater windings, a 5 volt, and two 2.5 volt center tapped windings(one for 5 tubes and one for 2 tubes and the dial light). the transformer is completly fried , the radio is 100 watts so .8 amps , it blows 2.5 amp fuses. my new replacement has the same 5 volt, primary, and one 2.5 volt center tap, and one 2.5 volt non center tap. does the center tap do anything important in the heater circut?

Ian:
That depends. If the tubes have cathodes, then the center tap is prabably grounded for hum reduction. Without cathodes, the center tap is probably used to connect the filament to power supply negative, or perhaps to negative through a resistor for grid bias. A winding for two tubes and a pilot light suggests a push-pull output stage, with the center tap being used to bias the filament above negative ground, in order to have a negative bias on the grid with respect to cathode. I would need a schematic of your radio to tell you more.
Lewis L.

the radio that is being fixed is an rca r-73, and the replacement transformer is from and rca r-72

thr rca-72 is also a GE j-86, but the schematic on this website is for the rca r-72

If you don't want to pull the transformer from the RCA-72, you can get a similar transformer from www.tubesandmore.com. The transformer they sell has two 2.5 volt windings, one with a center tap, a 5.0 volt winding, and a 350-0-350 volt winding.

Thomas

i alredy took the transformer out of the r72 it was very rusty and completly wrecked. the r 73 is much nicer plus i have the cabinet for the 73

that transformer has the same windings as my replacement